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SHARE-BASED COMPENSATION PLANS (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share Options |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Risk-free interest rate (as a percent) |  | 0.60% | 1.90% | 2.70%
Expected dividend yield (as a percent) |  | 3.80% | 3.90% | 3.90%
Volatility (as a percent) |  | 25.00% | 20.00% | 32.00%
Weighted average expected life of the options |  | 6 years | 6 years | 6 years
Weighted average grant date fair value of options granted per share (in dollars per share) |  | $ 4.62 | $ 3.66 | $ 6.35
Term |  | 10 years | 10 years | 10 years
Share options, additional general disclosures |  |  |  |
Compensation expense recognized (in dollars) |  | $ 2,300,000 | $ 2,000,000.0 | $ 1,800,000
Vesting period |  | 3 years |  |
Unrecognized compensation cost |  | $ 2,500,000 |  |
Unrecognized compensation cost recorded, period |  | 1 year 8 months 12 days |  |
Number of Shares Under Option |  |  |  |
Balance at the beginning of the period (in shares) |  | 2,118,090 |  |
Options granted (in shares) |  | 592,456 |  |
Options canceled (in shares) |  | (27,743) |  |
Options exercised (in shares) |  | (418,999) |  |
Balance at the end of the period (in shares) |  | 2,263,804 | 2,118,090 |
Vested or expected to vest at the end of the period (in shares) |  | 2,263,804 |  |
Exercisable at the end of the period (in shares) |  | 1,202,882 |  |
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 26.37 |  |
Options granted (in dollars per share) |  | 33.70 |  |
Options canceled (in dollars per share) |  | 32.33 |  |
Options exercised (in dollars per share) |  | 18.77 |  |
Balance at the end of the period (in dollars per share) |  | 29.63 | $ 26.37 |
Vested or expected to vest at the end of the period (in dollars per share) |  | 29.63 |  |
Exercisable at the end of the period (in dollars per share) |  | $ 27.17 |  |
Weighted Average Remaining Contractual Term |  |  |  |
Balance at the end of the period |  | 6 years 9 months 25 days | 6 years 4 months 20 days |
Options granted |  | 9 years 3 days |  |
Options canceled |  | 0 years |  |
Options exercised |  | 3 years 29 days |  |
Vested or expected to vest at the end of the period |  | 6 years 9 months 25 days |  |
Exercisable at the end of the period |  | 5 years 4 months 13 days |  |
Aggregate intrinsic value |  |  |  |
Options, exercisable (in dollars) |  | $ 35,800,000 |  |
Options, vested or expected to vest and exercisable (in dollars) |  | 61,800,000 |  |
Options exercised (in dollars) |  | $ 10,600,000 | $ 900,000 | $ 9,100,000
Restricted Shares | Minimum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 3 years |  |
Restricted Shares | Maximum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 5 years |  |
Performance Shares |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Term |  | 3 years |  |
Restricted Stock and Performance Shares |  |  |  |
Assumptions used for estimating the fair value of share options |  |  |  |
Risk-free interest rate (as a percent) |  | 0.20% | 1.70% | 2.60%
Volatility (as a percent) |  | 28.00% | 19.00% | 23.00%
Share options, additional general disclosures |  |  |  |
Compensation expense recognized (in dollars) |  | $ 5,800,000 | $ 5,200,000 | $ 4,900,000
Unrecognized compensation cost |  | $ 6,700,000 |  |
Unrecognized compensation cost recorded, period |  | 2 years |  |
Number of Non-Vested Restricted Shares |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 382,901 |  |
Granted (in shares) |  | 176,825 |  |
Vested (in shares) |  | (160,549) |  |
Forfeited (in shares) |  | (11,476) |  |
Non-vested at the end of the period (in shares) |  | 387,701 | 382,901 |
Restricted Shares & Performance Units |  |  |  |
Weighted average fair value of restricted shares and performance units granted |  | $ 39.37 | $ 32.39 | $ 32.22
Total fair value of restricted shares and performance units vested |  | $ 7.0 | $ 6.1 | $ 5.8
Plan |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |
Additional shares authorized | 4,500,000 |  |  |
Shares reserved for future issuance | 991,117 |  |  |
Shares available for future awards |  | 2,448,384 |  |
Percentage of shares that may not be subject to specific limitations |  | 5.00% |  |
Maximum term of options |  | 10 years |  |
Plan | Minimum |  |  |  |
Share options, additional general disclosures |  |  |  |
Vesting period |  | 1 year |  |
Plan | Share Options |  |  |  |
Number of Shares Under Option |  |  |  |
Balance at the end of the period (in shares) |  | 2,263,804 |  |
Plan | Restricted Shares |  |  |  |
Number of Non-Vested Restricted Shares |  |  |  |
Non-vested at the end of the period (in shares) |  | 387,701 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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